The conventional tuned mass damper (TMD) has the defect of a narrow tuning band in the stability control of a floating wind turbine (FWT). In this paper, a hybrid vibration reduction method of tuned mass damper-nonlinear energy sink (TMD-NES) is proposed, which makes full use of the broadband advantage of NES and can effectively avoid its initial energy sensitivity disadvantage. A FWT dynamics model with TMD-NES was established, the complex variable average method was used to solve the dynamic response of the system, and the Runge–Kutta method is used to prove the reliability of the analytical method. The bifurcation characteristics of NES and the vibration suppression effect of TMD-NES are analyzed and discussed. The results show that the proposed method reduces the peak energy of the tower surge response by 95.3%, broadens the frequency band of vibration reduction, reduces the sensitivity to the initial energy, and improves the robustness of the system.
Offshore wind turbines will be developed from shallow water to deep water to meet the rapid growth of wind power generation. Floating offshore wind turbine (FOWT) face complex load challenges, which endanger their safety and service life. Hence, it is urgent to develop a novel damping devices to improve the stability of FOWT. In this paper, a novel extended tuned mass damper (ETMD) is proposed. On this basis, a linear quadratic regulator (LQR) is added to realize the design and simulation of the extended active tuned mass damper (EATMD) control system to reduce the surge response of FOWT. Numerical analysis shows that under the control of ETMD, the surge response of the tower is reduced by 73%, and the frequency modulation width is increased by 55%. Here, under the control of EATMD, the displacement, velocity and acceleration of the surge response of the tower are decreased by 47.0%, 30.7% and 24.2%, respectively.
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